Last updated on October 10th, 2024 at 06:29 am

Here, We see PHP LinkedIn Skill Assessment Answer. This assessment test consists of 15-20 MCQs to demonstrate your knowledge of your selected skills. MCQs come from different topics – Arrays, Classes, Language Basics, Syntax, and Utility Functions..

List of all LinkedIn Skills Assessment Answer

PHP LinkedIn Skill Assessment Answer

Q1. What does this code output?

echo 76 <=> '76 trombones';

1
-1
a parser error
0✔

Both sides of the “spaceship” are equal, so the answer is 0. PHP will convert ’76 trombones’ to 76 in this context, as the string starts with ’76’. Try it! For php 8.0 and forward the answer is [x] -1, for previous versions the answer is [x] 0. PHP 8 changed the way non-strict comparison between numbers and non-numeric strings work.

Q2. Which is the most secure way to avoid storing a password in clear text in the database?

$encrypted = shal($password);
$encrypted = crypt($password, \$salt);
$encrypted = md5($password);
$encrypted = password_hash($password, PASSWORD_DEFAULT);✔

Q3. What does this script do?

$email = filter_input(INPUT_POST, 'email', FILTER_VALIDATE_EMAIL);
if ($email === false) {
    $emailErr = "Please re-enter valid email";
}

It makes sure the email address is a good and functioning address
It makes an email safe to input into a database
It assigns an email to a variable and then removes all illegal characters from the $email variable
It verifies that an email address is well-formed.✔

Q4. In the following script, which line(s) will cause an error(s)?

1<?php2$count = 0;
3$_xval = 5;
4$_yval = 1.0;
5$some_string = "Hello there!";
6$some_string = "How are you?";
7$will i work = 6;
8       $3blindmice = 3;
9?>

Line 6 will cause an error because you can’t reassign a new value to a variable that has already been set.
Line 7 and 8 will cause an error. Line 7 has whitespace in $will I work and should be $will_i_work. Line 8 cannot start with a number because it is a variable.✔
Line 5 will cause an error because some_string should be someString.
Line 3 and 4 will cause an error because a variable cannot start with an underscore(_).

Q5. In a conditional statement, you want to execute the code only if both values are true. Which comparison operator should you use?

||
&
<=>
&&✔

Q6. All variables in PHP start with which symbol?

&
%
_
$✔

Q7. What is the key difference between GET and POST?

GET is used with the HTTP protocol. POST is used with HTTPS.
GET displays the submitted data as part of the URL. During POST, this information is not shown, as it’s encoded in the request body.✔
GET is intended for changing the server state and it carries more data than POST.
GET is more secure than POST and should be used for sensitive information.

Q8. The operator is useful for sorting operations. It compares two values and returns an integer less than, equal to, or greater than 0 depending on whether the value on the is less than, equal to, or greater than the other

greater-than; right
spaceship; left✔
equality; right
comparison; left

Q9. Which are valid PHP error-handling keywords?

try, throw, catch, callable
try, yield, catch, finally
yield, throw, catch, finally
try, throw, catch, finally✔

Q10. Which value equates to true?

0
NULL
”
-1✔

Q11. What is missing from this code, which is supposed to create test cookies?

$string_name = "testcookie";
$string_value = "This is a test cookie";
$expiry_info = info()+259200;
$string_domain = "localhost.localdomain";

The $_REQUEST is missing.
The $_COOKIES array is missing.
The cookie session is missing.
The call to setcookie() is missing.✔

Q12. What is the value of $total in this calculation?

$total = 2 + 5 * 20 – 6 / 3

44
138
126
100✔

Q13. What is the purpose of adding a lowercase “u” as a modifier after the final delimiter in a Perl-compatible regular expression?

It makes the dot metacharacter match anything, including newline characters.
It makes the pattern match uppercase letters.
Both the pattern and subject string are treated as UTF-8.✔
It inverts the greediness of the quantifiers in the pattern so they are not greedy by default.

Q14. Which code snippet uses the correct syntax for creating an instance of the Pet class?

$dog = new Pet;
all of these answers✔
$horse = (new Pet);
$cat = new Pet();

Q15. What is the best way to explain what this script does?

if (!$_SESSION['myusername'])
{
  header('locaton: /login.php');
  exit;
}

This script times out the session for myusername.
Cookies are starting to be stored as a result of this script.
This script validates the username and password.
This script is on a page that requires the user to be logged in. It checks to see if the user has a valid session.✔

Q16. Which is the correct format for adding a comment to a PHP script?

all of these answers✔
#This is a comment
/* This is a comment */
// This is a comment

Q17. PHP supports multiple types of loops. If you wanted to loop through a block of code if and as long a specified condition is true, which type of loop would you use?

for
do-while
while✔
foreach

Q18. The ignore_user_abort( ) function sets whether a client disconnect should abort a script execution. In what scenario would you, as a web developer, use this function?

You would use it to stop a user from clicking the back button if they decide not to view as a result of a click.
You would use this function if you have some important processing to do and you do not want to stop it, even if your users click Cancel.✔
You would use this function if you wanted to abort the script for all logged-in users, not just the one who disconnected.
You would use this function if you want a PHP script to run forever.

Q19. The PHP function array_reduce() takes a callback function that accepts a value carried over each iteration and the current item in the array and reduces an array to a single value. Which code sample will sum and output the values in the provided array?

<?phpechoarray_reduce([1, 2, 5, 10, 11], function ($item, $carry) {
      $carry = $carry + $item;
  });
?>

<?phpechoarray_reduce([1, 2, 5, 10, 11], function ($carry, $item) {
      return$carry = $item + $item;
  });
?>

<?phparray_reduce([112, 5, 10, 11], function ($item, $carry) {
      echo$carry + $item;
  });
?>

D✔

<?phpechoarray_reduce([1, 2, 5, 10, 11], function ($carry, $item) {
      return$carry += $item;
  });
?>

Q20. Which PHP script uses a constructor to display the string “Winter is almost over!”?

A✔

class MyClass {
  publicfunction _construct()
  {
  echo'Winter is almost over!'."\n";
  }
  }
  $userclass = new MyClass;

class MyClass {
  publicfunction _construct()
  {
  echo'Winter is almost over!.."\n";
  }
  }
  $userclass = new MyClass;

class MyClass {
  publicfunction _construct()
  {
  echo'Winter is almost over!.."\n";
  }
  }
  $userclass = new MyClass;

class MyClass {
  publicfunction _construct()
  {
  echo'Winter is almost over!'."n";
  }
  }
  $userclass = MyClass;

Q21. How might you troubleshoot a “call to undefined function” error?

Make sure you have imported the file containing the function.
Make sure you have spelled the function name correctly.
all of these answers✔
Make sure the function declaration is at an earlier point in the code than the function call.

Q22. Which line could you NOT use to comment out “Space: the final frontier”?

/* Space: the final frontier */
*/ Space: the final frontier /*✔
#Space: the final frontier
// Space: the final frontier

Q23. What displays in a browser when the following code is written?

<?php echo "How much are the bananas?"?>

The browser would display nothing due to a syntax error.
The browser would display an error since there are no parentheses around the string.
The browser would display How much are the bananas?✔
The browser would display an error since there is no semicolon at the end of the echo command.

Q24. Which operator would you use to find the remainder after division?

/
%✔
//
DIV

Q25. What is the significance of the three dots in this function signature?

function process(...$vals) {
    // do some processing
}

It makes the function variadic, allowing it to accept as an argument an array containing an arbitrary number of values.
It makes the function variadic, allowing it to accept an arbitrary number of arguments that are converted into an array inside the function.✔
It temporarily disables the function while debugging other parts of the script.
It’s a placeholder like a TO DO reminder that automatically triggers a notice when you run a script before completing the function definition.

Q26. Assuming the Horse class exists, which is a valid example of inheritance in PHP?

class Pegasus extends Horse {}✔
class Alicorn imports Pegasus, Unicorn {}
class Unicorn implements Horse {}
class Horse inherits Unicorn {}

Q27. Both triple === and double == can be used as variables in PHP. If you want to hear that string “33” and the number 33 are equal, you would use. If you want to check if an array contains a particular string value at a particular index, you would use _

compare; doubles; triples✔
compare; triples; doubles
assign; triples; doubles
assign; doubles; triples

Q28. Your PHP page is unexpectedly rendering as totally blank. Which step will shed light on the problem?

Add this code to the top of your script: ini_set('display_errors',1);
check the server error logged
all of these answers✔
make sure you are not missing any semicolons

Q29. Which is the way to create an array of “seasons”?

seasons=array(
    1=>'spring',
    2=>'summer',
    3=>'autumn',
    4=>'winter',
);

$seasons=array(spring,summer,autumn,winter);
$seasons=(‘spring’,’summer’,’autumn’,’winter’);
$seasons=[‘spring’,’summer’,’autumn’,’winter’];✔

Q30. Both self and this are keywords that can be used to refer to member variables of an enclosing class. The difference is that $this->member should be used for members and self::$member should be used for members

private, public
object, primitive
non-static, static✔
concrete, abstract

Q31. What will this code print?

$mathe=array('archi','euler','pythagoras');
array_push($mathe,'hypatia');
array_push($mathe,'fibonacci');
array_pop($mathe);
echoarray_pop($mathe);
echosizeof($mathe);

euler3
hypatia5
hypatia3✔
fibonacci4

Q32. You are using the following code to find a user’s band, but it is returning false. Which step(s) would solve the problem?

isset ($_GET['fav_band'])

check if fav_band is included in the query string at the top of your browser
all of the answers✔
View the source of the form and make sure there is an input field with the name ‘fav_band’
print everything that has been transmitted in the request: print_r($_REQUEST);

Q33. Which code would you use to print all the elements in an array called $cupcakes?

all of the answers✔
print_r($cupcakes);
var_dump($cupcakes);
foreach($cupcakes as &$cupcake) echo $cupcake;

Q34. What is the cause of ‘Cannot modify header information – headers already sent’?

You are trying to modify a private value
Semicolon missing
Using a key on an array that does not exist
Some HTML is being sent before a header() command that you are using for a redirect✔

Q35. Which php control structure is used inside a loop to skip the rest of the current loop code and go back to the start of the loop for the next iteration

else
break
return
continue✔

Q36. The php not operator is !. Given the snippet, is there an output and what is it?

there is an output ‘2 is an even number
output ’21 is an odd number’✔
no output. Syntax error due to missing semicolon at the end
no output due to % in $num%2!=0

Q37. You want to list the modules available in your PHP installation. What command should you run?

php -h
php info
php -v
php -m✔

Q38. For the HTML form below, what is the correct functioning script that checks the input “mail” to be sure it is filled before proceeding?

if (!empty($_POST["mail"])) {
echo"Yes, mail is set";
} else {
echo"No, mail is not set";
} (correct)

Q39. What is the value of $result in this calculation?

$result = 25 % 6;

4.167
1.5
4
1✔

Q40. What is the job of the controller as a component in MVC?

The controller handles data passed to it by the view and also passes data to the view. It interprets data sent by the view and disperses that data to the appropriate models awaiting results to pass back to the view.✔
The controller is a mechanism that allows you to create reusable code in languages such as PHP, where multiple inheritance is not supported.
The controller presents content through the user interface, after communicating directly with the database.
The controller handles specific tasks related to a specific area of functionality, handles business logic related to the results, and communicates directly with the database.

Q41. Why does this code trigger an error?

$string = 'Shylock in Shakespeare's "Merchant of Venice" demands his pound of flesh.';

Strings should always be wrapped in double quotes, and double quotes inside a string should be escaped by backslashes.
All single and double quotes inside a string need to be escaped by backslashes to prevent a parse error.
The opening and closing single quotes should be replaced by double quotes, and the apostrophe should be escaped by a backslash.
The apostrophe needs to be escaped by a backslash to prevent it from being treated as the closing quote.✔

NULL✔
TRUE
FALSE
0

Q43. Assuming that $first_name and $family_name are valid strings, which statement is invalid?

echo $first_name. ‘ ‘. $family_name;
print $first_name, ‘ ‘, $family_name;✔
print $first_name. ‘ ‘. $family_name;
echo $first_name, ‘ ‘, $family_name;

Q44. Which code snippet demonstrates encapsulation?

class Cow extends Animal {
      private$milk;
  }

class Cow {
      public$milk;
  }
  $daisy = newCow();
  $daisy->milk = "creamy";

class Cow {
      public$milk;
      function getMilk() {`
          return$this->milk;
      }
  }

D✔

class Cow {
      private$milk;
      publicfunction getMilk() {
          return$this->milk;
      }
  }

Q45. The following XML document is in books.xml. Which code will output “Historical”?

<books><book><title>A Tale of Two Cities</title><author>Charles Dickens</author><categories><category>Classics</category><category>Historical</category></categories></book><book><title>Then There Were None</title><author>Agatha Christies</author><categories><category>Mystery</category></categories></book></books>

$books = simplexml_load_string('books.xml');
  echo$books->book[0]->categories->category[1];

B✔

$books = simplexml_load_file('books.xml');
  echo$books->book[0]->categories->category[1];

$books = SimpleXMLElement('books.xml');
  echo$books->book[0]->categories->category[1];

$books = SimpleXML('books.xml');
  echo$books->book[0]->categories->category[1];

Q46. When it comes to the value of a variable, what is the difference between NULL and empty?

NULL is a blank value; empty is the lack of a value.
A NULL value has an allocated address in memory; empty does not.
NULL refers to the lack of a value for an integer; empty refers to the lack of a value for a string.
NULL is the lack of a value; empty is a blank value.✔

Q47. What would be a good name for this function?

function doStuff($haystack, $needle) {
      $length = strlen($needle)
      if (substr($haystack, 0, $length) == $needle)
        returntrue;
      elsereturnfalse;
}

equals
endsWith
startsWith✔
contains

Q48. If you want to pass a form field to another page when a button is clicked, you should use the. If you want to store information across multiple pages, you should use the?

request; response
response; request
session; request
request; session✔

Q49. You are using the following code to decide if a button is clicked, but it is never returning true. Which step is most likely to shed light on the problem?

isset($_POST['submit'])

Make sure the input field displaying the button is named ‘submit’✔
Make sure you are not missing any semicolons
Print everything in the session print_r($_SESSION);
Look in the query string at the top of your browser to see if submit is assigned a value

Q50. Why should you follow a PSR standard?

because coding standards often vary between developers and companies✔
because coding standards are monitored for compliance across developers and companies
because there are mandatory coding standards among developers and companies
if using certain platforms because the PSRs apply to those platforms only

Q51. What are getters and setters?

Getters and setters ensure that if a data member is declared private, then it can be accessed only within the same function, not by an outside class
Getters and setters are utility functions within PHP that allow loading from, and saving to, a database
Getters and setters encapsulate the fields of a class by making them accessible only through its private methods and keep the values themselves public
Getters and setters are methods used to declare or obtain the values of variables, usually private ones✔

Q52. What are the recommended settings in the PHP configuration file, php.ini, for a testing environment?

  report_errors = E_ALL
  display_errors = On

B✔

  error_reporting = E_ALL
  display_errors = On

  error_reporting = E_ALL & ~E_NOTICE
  display_errors = Off

  error_reporting = E_ALL & ~E_NOTICE
  display_errors = On

Q53. Which PHP variable name is invalid?

$Double
$double
$_2times
$2times✔

Q54. Which command will extract the domain suffix (“com”) from the string $string = “https://cat-bounce.com”;?

sub($string, -3)
substr($string, -3)✔
substr($string, 3)
$string.substr(-3)

Q55. Where is the PHP code executed?

in the client’s browser
in the virtual machine
in the memory of the computer viewing the webpage
on a web server✔

Q56. Which is not a valid magic constant?

__RESOURCE__✔
__FUNCTION__
__CLASS__
__TRAIT__

Reference

Q57. What is below script will print?

if( 1 == true){
        echo"1";
  }

  if( 1 === true){
      echo"2";
  }

  if("php" == true){
      echo"3";
  }

  if("php" === false){
      echo"4";
  }

134
13✔
1
123

Q58. When should this PHP script be used?

$secret_word = 'if i ate spinach';
setcookie('login', $_REQUEST['username']. ','. md5($_REQUEST['username'].$secret_word));

when a user goes to pay for an item online
when items are placed in a cart
at first registration
at every login, for security✔

Q59. A PHP “variable variable” takes the value of a variable and treats that as the name of a variable. For example, if $var is a variable then $$var is a variable variable whose name is the value of $var. Which script produces the output below, using variable variables?

Cat
Dog
Dog

$name = "Cat";
  $name = "Dog";
  echo$name . "<br/>";
  echo$$name . "<br/>";
  echo$Dog;

$name = "Cat";
  $$name = "Dog";
  echo$name . "<br/>";
  echo$$name . "<br/>";
  echo$Dog;

C✔

$name = "Cat";
  $$name = "Dog";
  echo$name . "<br/>";
  echo$$name . "<br/>";
  echo$Cat;

$name = "Cat";
  $$name = "Dog";
  echo$name . "<br/>";
  echo$name . "<br/>";
  echo$Cat;

Q60. Imagine a web application, built following a MVC architecture, that contains a quiz and a button to score it, When the user presses the Score button, which component should handle the request?

router
controller✔
model
view

Q61. Which script might be used to continue a user’s search for music, across different webpages?

<?phpstart_session();
      $music = $_SESSION['music'];
  ?>

<?phpsession_start();
      $music = $SESSION['music'];
  ?>

<?phpstart_session();
      $music =$session['music'];
  ?>

D✔

<?phpsession_start();
      $music = $_SESSION['music'];
  ?>

Q62. Which PHP script finds the earliest and latest dates from an array?

A✔

<?php$dates = array('2018-02-01', '2017-02-02', '2015-02-03');
  echo"Latest Date: ". max($dates)."\n";
  echo"Earliest Date: ". min($dates)."\n";
  ?>

<?php$dates = array('2018-02-01', '2017-02-02', '2015-02-03');
  echo"Latest Date: ". min($dates)."\n";
  echo"Earliest Date: ". max($dates)."\n";
  ?>

<?php$dates = array('2018-02-01', '2017-02-02', '2015-02-03');
  echo"Latest Date: ". ($dates)."\n";
  echo"Earliest Date: ". ($dates)."\n";
  ?>

<?php$dates = array('2018-02-01', '2017-02-02', '2015-02-03');
  echo"Latest Date: "max($dates)."\n";
  echo"Earliest Date: "min($dates)."\n";
  ?>

Q63. What is the resulting output of this for statement?

$kilometers = 1;
for (;;) {
    if ($kilometers > 5) break;
       echo"$kilometers kilometers = ".$kilometers*0.62140. " miles. <br />";
    $kilometers++;
}

A✔

  kilometers = 0.6214 miles.
  kilometers = 1.2428 miles.
  kilometers = 1.8642 miles.
  kilometers = 2.4856 miles.
  kilometers = 3.107 miles.

  kilometers = 0.6214 miles.
  kilometers = 1.2428 miles.
  kilometers = 1.8642 miles
  kilometers = 2.4856 miles.
  kilometers = 3.107 miles.
  kilometers = 3.7284 miles.

  kilometers = 1.2428 miles.
  kilometers = 1.8642 miles.
  kilometers = 2.4856 miles.
  kilometers = 3.107 miles.

FATAL ERROR syntax error, unexpected ‘)’, expecting ‘;’ on line number 2

Q64. In PHP 7, What is the correct way to import multiple classes from namespace in a single declaration ?

use myApp\myNamespace{ClassA, ClassB, ClassC};✔
use myApp\myNamespace\ClassA, ClassB, ClassC;
use myApp\myNamespace[ClassA, ClassB, ClassC];
use myApp\myNamespace(ClassA, ClassB, ClassC);

Q65. Which is the most complete list of data types that PHP supports?

string, integer, float, boolean, array, object, NULL, resource✔
string, integer, boolean, array, object, NULL, resource
string, integer, float, array, object, NULL, resource
string, integer, float, boolean, array, object, NULL

reference

Q66. What type of computer language is PHP?

server-side scripting language✔
compiled language
machine language
algorithmic language

Q67. Which superglobal variable holds information about headers, paths, and script locations?

$_SERVER✔
$SERVER_VARIABLES
$_ENV
$GLOBALS

reference

Q68. Describe what happens if you run this code in a testing environment

$capitals = ['UK' => 'London', 'France' => 'Paris'];
echo"$capitals['france'] is the capital of France.";

It displays: “Paris is the capital of France.”
It displays: ” is the capital of France.”
It triggers a syntax error because the array keys on line 1 are in quotes.
It triggers a syntax error because the array key on line 2 is in quotes.✔

Also, ‘france’ key must be capitalized!

Q69. DRY (Don’t Repeat Yourself) is a principle of software development aimed at reducing repetition of software patterns. Which choice is not a way to write DRYer code with PHP?

inheritance
classes
namespacing✔
dependency injection

Q70. Which code will return the IP address of the client?

$HTTP_SERVER_VARS(“REMOTE_IP”)
$_SESSION[“REMOTE_ADDR”];✔
$_SERVER[“HTTP_X_FORWARDED_FOR”]
getenv(“REMOTE_ADDR”)✔

Both 2 and 4 are correct!

Q71. Your site must allow uploading of large files. What might you need to do?

Make sure the user has the proper permissions.
Keep a count of upload file sizes and log them.
Change the upload_max_filesize configuration parameter.✔
Be sure to use chunked transfer encoding.

Q72. What is the output of this script?

$my_text = 'The quick grey [squirrel].';
preg_match('#\[(.*?)\]#', $my_text, $match);
print$match[1]."\n";

squirrel✔
The quick grey [squirrel].
[squirrel]
The quick grey squirrel.

Q73. What is the output of this script?

$fruits = ['apple', 'orange', 'pear', 'mango', 'papaya']; $i = 0; echo $fruits[$i+=3];

mango✔
apple
a parse error
pear

Q74. What are some of the main types of errors in PHP?

notices, warnings, fatal✔
runtime, logical, compile
semantic, logical, syntax
warnings, syntax, compile

Q75. What is the correct way to include the file gravy.php in the middle of the HTML code?

<!– include file=”gravy.php”; –>
<?php include gravy.php; ?>
<?php include “gravy.php”; ?>✔
<?php include file=”gravy.php”; ?>

Q76. Which two functions can sanitize text and validate text formats?

session_start() and filter_input()
filter_var() and filter_input()✔
preg_match() and strstr()

Q77. Why is it not recommended to make all of a class’s variables public?

Doing so makes your code tightly coupled.
The attribute may be accessed only by the class that defines the member.
You will have no control over which values the attribute can take. Any external code will be able to change it without any constraint.✔
You can then access the attribute only within the class itself, and by inheriting and parent classes.

Q78. You want to use wildcard characters when searching for records in a MySQL/MariaDB database using a PDO-prepared statement. Which code should you use?

$statement->bindValue(‘:name’, ‘%’ . $_GET[‘name’] . ‘%’);✔
$statement->bindValue(‘%’ . $_GET[‘name’] . ‘%’, ‘:name’);
$statement->bindParam(‘:name’, ‘%’ . $_GET[‘name’] . ‘%’);
$statement->bindParam(‘%’ . $_GET[‘name’] . ‘%’, ‘:name’);

Q79. Create an associative array using $array1 as the keys and $array2 as the values

$array1 = ['country', 'capital', 'language']; $array2 = ['France', 'Paris', 'French'];

$array3 = array_merge($array1, $array2);
$array3 = array_union($array1, $array2);
$array3 = array_keys($array1, $array2);
$array3 = array_combine($array1, $array2);✔

Q80. Assume that $r is 255, and $g and $b are both 0. What is the correct code to output “#ff0000”?

printf(‘#%2x%2x%2x’, 255, 0, 0);
printf(‘#%2X%2X%2X’, $r, 0, 0);
printf(‘#%x%x%x’, 255, 0, 0);
printf(‘#%02x%02x%02x’, 255, 0, 0);✔

Q81. You want to find out what day Twelfth Night falls on after Christmas 2018. Which code should you use?

$xmas = new DateTime(‘Dec 25, 2018’); $twelfth_night = $xmas->add(new DateInterval('P12D')); echo $twelfth_night->format('l');
$twelfth_night = strtotime(‘December 25, 2018 + 12 days’); echo date('d', $twelfth_night);
$twelfth_night = strtotime(‘December 25, 2018 + 12 days’); echo strftime('%d', $twelfth_night);✔
$xmas = new DateTime(‘Dec 25, 2018′); $twelfth_night = $xmas->add(strtotime(’12 days’)); echo $twelfth_night->format(‘D’);

1 seems correct, but the question asks for “day”, not day of the week. Twelfth Night is the “06” day of January, 2019.

Q82. Which loop displays all numbers from 1 to 10 inclusive?

$i = 1; while ($i < 10) { echo $i++ . ‘<br/>’; }
$i = 0; while ($i <= 10) { echo $i++ . ‘<br/>’; }
while ($i <= 10) { echo ++$i . ‘<br/>’; }
$i = 0; while ($i < 10) { echo ++$i . ‘<br/>’; }✔

Q83. Which are types of control structures in PHP?

break, continue, do-while, exception, for, foreach, if, switch, throw, while✔
values, operators, expressions, keywords, comments
for, foreach, if, else, else if, switch, tries, throws, while
if-then-else, do-while, for-each, go-to, stop-when

reference

Q84. Which function can you use in error handling to stop the execution of a script and is equivalent to exit()?

die✔
return
throw
break

Q85. Is the output of this code in descending order, shown vertically, and with spaces between numbers? And what is the output?

$numbers = array(4,6,2,22,11);
sort($numbers);
$arrlength = count($numbers);
for($x = 0; $x < $arrlength; $x++){
    echo$numbers[$x];
    echo"<br />";
    }

This does not meet all the criteria because the resulting numbers will be “2461122”, which is in no particular order.
This meets the criteria because the
is present and sort() lists in descending order
This does not meet all the criteria because the sort() function sorts an indexed array in ascending order. Thus this code will display “2 4 6 11 22” shown vertically, but the numbers are spaced.✔
does not meet all the criteria because the echo simply result in showing the array numbers in the order shown within the $numbers array, which is ascending

Q86. Which is not true of the toString() in PHP?

It saves a lot of work of using setters methods to access the values of objects.
It saves a lot of work of using getters methods to access the values of objects.
It allows you to call an object and see its components as a string.✔
It is automatically called when you use echo or print.

Q87. What is a generator and how is it used in PHP?

A generator is a function that produces a series of random values for unit testing code.
A generator is a simple iterator capable of producing a series of results. It has the same syntax as a function, except it uses “next” instead of “return”.
A generator is a simple iterator capable of producing a series of results. It has the same syntax as a function, except it uses “yield” instead of “return”.✔
A generator is a function capable of producing a series of results. At the end of the series, it automatically starts from the first one again.

Q88. What is the best description of what this script is/does?

if( isset($user_info['url']) ) {
  $_SESSION["loggedIn"] = true;
  $_SESSION["username"] = $myusername;
  header('Location: ' . $user_info['url']); //Redirects to the supplied url from the DB
} else {
  header("Location: error.htm");
}

It directs all users to the same page when they log in.
It is a login script for a user portal on a website.✔
It keeps the user logged in across different browsers.
It sends the user to an error page if they enter the wrong URL

Q89. What is the output of this code?

echo 5 % 0.75;

0
0.6666666666667
1
fatal error (division by zero)✔

Q90. Can you extend a final defined class?

No, because a final class or method declaration prevents child class or method overriding.✔
Specialized versions of built-in classes can be extended by calling the parent’s constructor.
Yes, if a final class is defined as private in the parent class.
Yes, a final defined class can be used to declare constants.

Q91. How can you test if a checkbox is set?

Use !empty($_GET[‘test’])✔
Use isset($_GET[‘test’])✔
Use $_GET[‘test’] == ”
all other answers

Actually both are correct, option 3 is actually testing if a checkbox is not set

A✔

if(empty($_POST['email'])) {
    echo"The email cannot be empty";
}

if(empty($_GET['email'])) {
    echo"The email cannot be empty";
}

if(empty($_POST('email'))) {
    echo"The email cannot be empty";
}

if(isset($email)) {
    echo"The email cannot be empty";
}

Q93. What is the PHP fatal error type?

This type of error causes a termination of the script execution when it occurs.
This type of error’s causes are not detected by the compiler and cause incorrect results.
This type of error causes erroneous results or may cause termination of the program.
This type of error causes termination after showing the list of errors and the line number where the errors have occurred.✔

Q94. Which script properly validates the IP address given?

$valid = ip2long($ip) !== false;

B✔

$ip_address = "164.12.2540.1";
if(filter_var($ip_address, FILTER_VALIDATE_IP)){
  echo"$ip_address is a valid IP address";
} else {
  echo"$ip_address is not a valid IP address";
}

$ip_address = "164.12.2540.1";
if(validate_ip($ip_address)){
  echo"$ip_address is a valid IP address";
} else {
  echo"$ip_address is not a valid IP address";
}

$ip_address = "164.12.2540.1"echois_valid($ip_address, VALIDATE_IP);

Q95. What is the output of this code?

$i = 0;
    while($i < 6) {
    if($i++ == 3) break;
    }
    echo"loop stopped at $i by break statement";

loop stopped at 3 by break statement
loop stopped at 4 by break statement✔
loop stopped at 6 by break statement
loop stopped at 2 by break statement

$dof->setTitle("Spot");
    $cat->setTitle("Mimi");
    $horse-?setTitle("Trigger");
    $dog->setPrice(10);
    $cat->setPrice(15);
    $horse->setPrice(7);
    print_r($cat);

Pet Object ( [title]=> Spot[price]=>10)
Pet Object ( [title]=> Mimi [price]=>15 )✔
Pet Object ( [title]=> Mimi[price]=>10 )
Pet Object ( [title]=> Trigger [price]=> 7)

Q97. Given the associative array below, which PHP code determines which element(s) of the array is/are apple?

$array = array(
'fruit1' => 'apple',
'fruit2' => 'orange',
'fruit3' => 'grape',
'fruit4' => 'apple',
'fruit5' => 'apple');

A✔

while ($fruit_name = current($array)) {
    if ($fruit_name == 'apple') {
        echokey($array).'<br />';
    }
    next($array);
}

while ($fruit_name = current($array)) {
    if ($fruitname == 'apple') {
        echokey($array).'<br />';
    }
    next($array);
}

while ($fruit_name = current($array)) {
    if ($fruit_name == 'apple')
        echokey($array).'<br />';
    }
    next($array);
}

while ($fruit_name = current($array)) {
    if ($fruit_name == 'apple') {
        echokey($array).'<br />';
    }

Q98. What does this code return?

class Smurf {

  public$name = "Papa Smurf";

  publicfunction __construct($name) {
    $this->name = $name;
  }

  publicfunction set_name($name) {
    $name = $name;
  }
}

$smurf = newSmurf("Smurfette");
$smurf->set_name("Handy Smurf");
echo$smurf->name;

nothing
Handy Smurf
Smurfette✔
Papa Smurf

Q99. You have an online form with a file input field called “image” for uploading files. Assuming the path to the upload directory is $path, which code should you use to make sure the file is uploaded from your form to the correct location?

A✔

if ($_FILES['image']['error'] === 0) {
      move_uploaded_file($_FILES)['image']['temp_name'],
          $path . $_FILES['image']['name']);
 )

if ($_FILES['image']['error'] === false) {
      move_uploaded_file($_FILES)['image']['temp_name'],
          $path . $_FILES['image']['name']);
 )

if ($_FILES['image']['error'] == 0) {
      copy($_FILES)['image']['temp_name'],
          $path . $_FILES['image']['name']);
 )

if ($_FILES['image']['error'] == false) {
      upload_file($_FILES)['image']['temp_name'],
          $path . $_FILES['image']['name']);
 )

Q100. Which super global variable holds information about headers, paths, and script locations?

$_GET
$GLOBALS
$_SESSION
$_SERVER✔

Q101. Using a for loop, how would you write PHP code to count backward from 10 to 1, in that order?

<?for ($i=1; $i <= 10; $i++) {
    echo$i;
}
?>

<?$i = 10;
while($i>=0) {
    echo$i;
    $i--;
}
?>

<?for($i = 10; $i > 0; $i++) {
        print"$i <br />\n";
    } // end for loop '''?>

D✔

<?for($i = 10; $i > 0; $i--) {
        print"$i <br />\n";
    } // end for loop?>

Q102. What is the output of this code?

function knights(){
return"a shrubbery";
}

if (knights())
printf "you are just and fair";
else
printf "NI!";

NI!
a syntax error
a shrubbery
you are just and fair✔

Q103. Which script defines the United States of America as a constant and prints this code?

Our country is United States of America Our country has a total of 50 states

define('country',"United States of America");
define('states',50);
echo"Our country is "country"<br>";
echo"Our country has a total of ".states." states";

B✔

define('country',"United States of America");
define('states',50);
echo"Our country is ".country."<br>";
echo"Our country has a total of ".states." states";

define(country,"United States of America");
define('states',50);
echo"Our country is ".country."<br>";
echo"Our country has a total of ".states." states";

define('country',"United States of America");
define('states','fifty');
$K = 'strval'; echo"Our {$K(Country)} has {$K(FIFTY)} states.";

Q104. What does this code output?

try{
echo"bodacious";
thrownewException();
} catch (Exception$e) {
echo"egregious";
} finally {
echo"excellent";
}

bodacious excellent
egregious excellent
bodacious egregious excellent✔
bodacious egregious

Q105. Passing by reference is a way to pass a variable to a function modify it inside the function, and have that modification stick when the variable is used outside the function. Which code correctly uses passing by reference to modify the variable for use outside the function?

1 function append($initial){ return $newString = $initial . ‘ belong to us’; } 2 $initialString = ‘All your base are’; 3 initialString = append(initialString=append(initialString); 4 echo $initialString;
1 function append(&$initial){ return $newString = $initial . ‘ belong to us’; } 2 initialString = ‘All your base are’; 3 append(initialString=′Allyourbaseare’;3append(initialString); 4 echo $initialString;
1 function append(&$initial){ return $newString = $initial . ‘ belong to us’; } 2 $initialString = ‘All your base are’; 3 initialString = append(initialString=append(initialString); 4 echo $initialString;
1 function append(&$initial){ $initial = $initial . ‘ belong to us’; } 2 initialString = ‘All your base are’; 3 append(initialString=′Allyourbaseare’;3append(initialString); 4 echo $initialString;✔

Q106. What is the output of this script?

$believable = 'false'; 
$myth = 'The moon is made of green cheese'; 
$calc = 10**3+1; 
if ($believable) { 
echo $myth; 
} else { 
echo $calc; 
}

10000
31
1001
The moon is made of green cheese

Explanation: ‘false’ evaluates to true since it is a string so the if condition is met.

Q107. What PHP control structure is used inside of a loop to skip the rest of the current loop’s code and go back to the start of the loop for the next iteration?

return
else
break
continue✔